Don't worry if you hate Twitter's curated For You tab, as you now have a better way to avoid it. Twitter is updating its web and mobile apps to default to the timeline tab you last had open. If you close the app after looking at the chronological Following tab like a sensible human being, you'll see it again when you come back. The tab default is rolling out today on the web, and "coming soon" to the Android and iOS apps.
This won't revert to the old "twinkle" button that saved space. It does let you stick to your preferred timeline, though. This could be particularly helpful if you want to follow time-sensitive events (one of the main reasons many people use Twitter) and would rather not switch tabs every time you check your feed.